CN107348831B - Electric cooker capable of correcting heating time and heating control method thereof - Google Patents

Electric cooker capable of correcting heating time and heating control method thereof Download PDF

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Publication number
CN107348831B
CN107348831B CN201710594040.7A CN201710594040A CN107348831B CN 107348831 B CN107348831 B CN 107348831B CN 201710594040 A CN201710594040 A CN 201710594040A CN 107348831 B CN107348831 B CN 107348831B
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temperature
heating
cooker
controller
heater
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CN107348831A (en
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吴联凯
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Foshan Shunde Nabang Electrical Appliance Co ltd
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00—Cooking-vessels
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J36/00—Parts, details or accessories of cooking-vessels
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J36/00—Parts, details or accessories of cooking-vessels
    • A47J36/24—Warming devices
    • A47J36/2483—Warming devices with electrical heating means
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J36/00—Parts, details or accessories of cooking-vessels
    • A47J36/32—Time-controlled igniting mechanisms or alarm devices

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Cookers (AREA)

Abstract

The invention provides an electric cooker based on corrected heating time and a heating control method. A heater which heats the inner pot; and the controller receives the quality signal sent by the quality sensor and outputs a control signal to control the power and the heating time of the heater. The heating control method is based on the electric rice cooker, the controller controls the heater to heat the inner pot, and the electric rice cooker cooks rice and is divided into a water absorption stage, a heating stage, a boiling stage with water, a boiling stage without water and a stewing stage.

Description

Electric cooker capable of correcting heating time and heating control method thereof
Technical Field
The invention belongs to the technical field of electric cookers, and particularly relates to an electric cooker and a heating control method thereof.
Background
Early rice cookers typically cooked rice in only two stages, "cook" and "keep warm," each using a fixed power, wherein the duration of the "cook" stage is set and the duration of the "keep warm" stage is actually selected according to the needs of the user. In order to improve the taste of the rice, the improved electric rice cooker divides the rice cooking stage into five sub-stages in detail: the heating power of the five sub-stages is different, wherein the heating stage is an important stage, the heating time determines the time for the water in the pot to reach the boiling point and also determines the temperature of the following stages, if the heating time is not enough, the required temperature cannot be reached, the rice is half-cooked, and if the heating time is too long, the situation of 'drying the pot' with too high temperature is caused.
The existing electric rice cooker mostly adopts a temperature control method, namely, water in a cooker is automatically switched to the next stage after being heated to 100 ℃ by fixed power, but the heating time of the temperature control is insufficient, firstly, the detected temperature is the temperature of a metal layer of an inner cooker, secondly, the detected temperature is the temperature of steam in the cooker, and the first detection mode is that the measured temperature of the inner cooker is higher than the temperature of water in the inner cooker because the heat conductivity of metal is higher than that of water; in the second detection mode, due to the reason that the steam is liquefied and releases heat on the surface of the temperature sensor, the temperature of the steam detected by the sensor is usually higher than the temperature of water in an actual pot, so that the rice cooker can prematurely switch the cooking stage, and the cooking time is insufficient and the temperature is low; secondly, the heating method does not consider the factors of the amount of the rice, for example, the time for the steam at the upper layer to reach 100 ℃ can be almost the same when 500g of the rice and 200g of the rice are put in the heating process, so the time for the rice cooker to actually heat can be the same, but the temperature of each part of the 500g of the rice and the 200g of the rice are different in the same heating time, because the heating of the rice needs a process of transferring heat from the periphery of the rice pile to the center of the rice pile, if the amount of the rice is put, the time heating time is not enough, the temperature inside and outside the whole rice is inconsistent, and the condition that the rice is pasted with a pot around the rice and the rice is half-cooked in the middle.
Disclosure of Invention
The invention provides an electric cooker which comprises a cooker body, an inner cooker arranged in the cooker body and a cooker cover used for covering the inner cooker, wherein a weighing sensor is arranged at the lower part of the inner cooker and used for detecting the mass of rice and water in the inner cooker and transmitting a mass signal to a controller. A heater which heats the inner pot; and the controller receives the quality signal sent by the quality sensor and outputs a control signal to control the power and the heating time of the heater. The electric cooker is also provided with a first temperature sensor and a second temperature sensor, the first temperature sensor is positioned on the inner surface of the cooker cover and used for measuring the temperature of steam in the inner cooker, and the second temperature sensor is positioned on the outer side of the cooker body and used for detecting the surface temperature of the cooker body.
The invention provides a heating control method of an electric cooker, which is based on the electric cooker, wherein a controller controls a heater to heat an inner pot, and the electric cooker cooks rice and is divided into a water absorption stage, a heating stage, a boiling stage with water, a boiling stage without water and a stewing stage, wherein the heating stage comprises the following steps:
step 1: the controller controls the heater to heat the inner pot until the first temperature sensor detects the temperature of the steam in the pot to generate a first temperature signalThe first temperature signal is sent to a controller, and the controller obtains the first temperature t of the steam in the boiler according to the first temperature signal1When said t is1The time period T of the heating period when the temperature reaches 100 DEG C0I.e. the base heating time;
step 2: the second temperature sensor detects the surface temperature of the pot body to generate a second temperature signal, and sends the second temperature signal to the controller, and the controller obtains a second temperature t of the surface temperature of the pot body according to the second temperature signal2；
Step 3: the controller determines the T value through the mass signal transmitted by the weighing sensor at the lower part of the inner pot0An internal mass change Δ m;
and 4, step 4: the controller is used for controlling the temperature according to the mass variation delta m and the first temperature t1A second temperature t2Calculating the corrected heating time length Tc；
And 5: the controller continuously sends a control signal to the heater to continuously heat the inner pot for Tc。
Step 6: the heating time T of the whole heating stage is T ═ T0+Tc；
In step 4, the controller calculates T according to the following formulac：
Figure GDA0002495205070000021
In the above formula, P is the heating power of the heater, K is the heat dissipation coefficient of the inner pot, A is the heat dissipation area of the inner pot, rWater (W)Is the latent heat of vaporization of water.
According to the electric cooker based on the heating time correction and the heating control method, the defects that the temperature measurement of the conventional electric cooker is inaccurate, and the heating time cannot be adjusted according to the actual cooking amount are effectively overcome, the uniformity and the accuracy of the temperature of the rice when different cooking amounts are heated are guaranteed, and the taste of the rice is improved.
Drawings
FIG. 1 is a flow of rice cooking with an electric cooker in the prior art;
FIG. 2 is a control flow of the heating stage of the electric rice cooker of the present invention.
Detailed Description
The invention is further illustrated below with reference to several examples.
The invention provides an electric cooker which comprises a cooker body, an inner cooker arranged in the cooker body and a cooker cover used for covering the inner cooker, wherein a weighing sensor is arranged at the lower part of the inner cooker and used for detecting the mass of rice and water in the inner cooker and transmitting a mass signal to a controller. A heater which heats the inner pot; and the controller receives the quality signal sent by the quality sensor and outputs a control signal to control the power and the heating time of the heater. The electric cooker is also provided with a first temperature sensor and a second temperature sensor, the first temperature sensor is positioned on the inner surface of the cooker cover and used for measuring the temperature of steam in the inner cooker, and the second temperature sensor is positioned on the outer side of the cooker body and used for detecting the surface temperature of the cooker body. The process of cooking rice by the electric cooker comprises a water absorption stage, a heating stage, a boiling stage with water, a boiling stage without water and a stewing stage, wherein in the heating stage, the controller controls the heater to heat the inner pot until the first temperature sensor detects the temperature of steam in the pot to generate a first temperature signal, the first temperature signal is sent to the controller, and the controller obtains the first temperature t of the steam in the pot according to the first temperature signal1When said t is1The time period T of the heating period when the temperature reaches 100 DEG C0Namely the basic heating time, the second temperature sensor detects the surface temperature of the pot body to generate a second temperature signal and sends the second temperature signal to the controller, and the controller obtains a second temperature t of the surface temperature of the pot body according to the second temperature signal2The controller is used for controlling the mass change quantity delta m and the first temperature t1A second temperature t2Calculating the corrected heating time length TcThe heating time period T of the whole heating stage is T ═ T0+Tc。
In a preferred embodiment, the controller sends a control signal to the heater so that the heater heats the inner pot at a constant power.
In one embodiment, the present invention provides a heating control method of an electric rice cooker, the control method is based on the electric rice cooker in the above embodiments, the process of cooking rice by the electric rice cooker is divided into a water absorption stage, a heating stage, a boiling stage with water, a boiling stage without water and a stewing stage, wherein the control method of the heating stage comprises the following steps:
step 1: the controller controls the heater to heat the inner pot until the first temperature sensor detects the temperature of the steam in the pot to generate a first temperature signal, and sends the first temperature signal to the controller, and the controller obtains the first temperature t of the steam in the pot according to the first temperature signal1When said t is1The time period T of the heating period when the temperature reaches 100 DEG C0I.e. the base heating time;
step 2: the second temperature sensor detects the surface temperature of the pot body to generate a second temperature signal, and sends the second temperature signal to the controller, and the controller obtains a second temperature t of the surface temperature of the pot body according to the second temperature signal2；
Step 3: the controller determines the heating period T through the mass signal transmitted by the weighing sensor at the lower part of the inner pot0An internal mass change Δ m;
and 4, step 4: the controller is used for controlling the temperature according to the mass variation delta m and the first temperature t1A second temperature t2Calculating the corrected heating time length Tc；
And 5: the controller continuously sends a control signal to the heater to continuously heat the inner pot for Tc。
Step 6: the heating time T of the whole heating stage is T ═ T0+Tc。
In step 4, the controller calculates T according to the following formulac：
Figure GDA0002495205070000041
In the above formula, P is the heating power of the heater, K is the heat dissipation coefficient of the inner pot, A is the heat dissipation area of the inner pot, rWater (W)Is waterLatent heat of vaporization.
In a preferred embodiment, the ratio of rice to water is 1: 1.
Further, as will be understood by those skilled in the art, if the heating power P of the heater is a variable power heating method, the controller can control and obtain the heating power P of the heater, at this time, the heating power P and the first temperature t1A second temperature t2The heating power P and the first temperature T of the heater are obtained in real time while the controller controls the heater to further heat the inner pot1A second temperature t2The left part of the equation equal sign is time-integrated until the integration result equals to the constant Δ mr on the right of the equation equal signWater (W). In the calculation of the approximation, the first temperature t can be considered1Is a constant value. In an alternative heating regime, the heater is at TcThe heating power P in the time is constant power.
The value of K is determined by the material of the inner pot, A is the heat dissipation area of the inner pot, and is related to the height and the diameter of the pot body.
The controller comprises a storage unit, a data table corresponding to the temperature signal is stored in the storage unit, and the controller obtains the first temperature value and the second temperature value in a table look-up mode. The arrangement of the temperature sensor, the controller, the heater and the weighing sensor, and the signal processing and controlling method are all the prior art, and are not described herein again.
The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can conceive of changes or substitutions within the technical scope of the present invention.

Claims (1)

1. A heating control method of an electric cooker comprises a cooker body, an inner cooker arranged in the cooker body and a cooker cover used for covering the inner cooker, wherein a weighing sensor is arranged at the lower part of the inner cooker and used for detecting the mass of rice and water in the inner cooker and transmitting a mass signal to a controller; a heater which heats the inner pot; the controller receives the mass signal sent by the weighing sensor and outputs a control signal to control the power and the heating time of the heater; the electric cooker is also provided with a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is positioned on the inner surface of the cooker cover and used for measuring the temperature of steam in the inner cooker, and the second temperature sensor is positioned on the outer side of the cooker body and used for detecting the surface temperature of the cooker body; the controller controls the heater to heat the inner pot and is divided into a water absorption stage, a heating stage, a boiling stage with water, a boiling stage without water and a stewing stage; characterized in that the control method of the heating phase comprises:
step 1: the controller controls the heater to heat the inner pot until the first temperature sensor detects the temperature of the steam in the pot to generate a first temperature signal, and sends the first temperature signal to the controller, and the controller obtains the first temperature t of the steam in the pot according to the first temperature signal1When said t is1The time period T of the heating period when the temperature reaches 100 DEG C0I.e. the base heating time;
step 2: the second temperature sensor detects the surface temperature of the pot body to generate a second temperature signal, and sends the second temperature signal to the controller, and the controller obtains a second temperature t of the surface temperature of the pot body according to the second temperature signal2；
And step 3: the controller determines the heating period T through the mass signal transmitted by the weighing sensor at the lower part of the inner pot0An internal mass change Δ m;
and 4, step 4: the controller is used for controlling the temperature according to the mass variation delta m and the first temperature t1A second temperature t2Calculating the corrected heating time length Tc；
In step 4, the controller calculates T according to the following formulac：
Figure FDA0002495205060000011
In the above formula, P is the heating power of the heater, K is the heat dissipation coefficient of the inner pot, and rWater (W)Latent heat of vaporization for water;
the heating power P of the heater adopts a variable power heating mode, the controller can control and obtain the heating power P of the heater, and at the moment, the heating power P and the first temperature t1A second temperature t2The heating power P and the first temperature T of the heater are obtained in real time while the controller controls the heater to further heat the inner pot1A second temperature t2The left part of the equation equal sign is time-integrated until the integration result equals to the constant Δ mr on the right of the equation equal signWater (W)The value of K is determined by the material of the inner pot, A is the heat dissipation area of the inner pot and is related to the height and the diameter of the pot body;
and 5: the controller continuously sends a control signal to the heater to continuously heat the inner pot for Tc；
Step 6: the heating period T ═ T of the heating stage0+Tc。
CN201710594040.7A 2017-07-20 2017-07-20 Electric cooker capable of correcting heating time and heating control method thereof Expired - Fee Related CN107348831B (en)

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Publication number Priority date Publication date Assignee Title
CN108451341B (en) * 2018-03-01 2020-03-17 广东美的厨房电器制造有限公司 Method for controlling a heating cooker and heating cooker
CN109770724A (en) * 2018-12-21 2019-05-21 广东伊莱特电器有限公司 A kind of pot with external temperature sensing

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08150075A (en) * 1994-11-30 1996-06-11 Matsushita Electric Ind Co Ltd Rice cooker
JP2005000490A (en) * 2003-06-13 2005-01-06 Matsushita Electric Ind Co Ltd Rice cooker
JP2005304521A (en) * 2004-04-16 2005-11-04 Matsushita Electric Ind Co Ltd Rice cooker
CN101940433A (en) * 2010-02-22 2011-01-12 谢国华 Electric heating kettle with weighting function and weighting control method thereof
CN102429574A (en) * 2011-10-31 2012-05-02 九阳股份有限公司 Electric pressure cooker capable of automatically controlling pressure and pressure control method thereof
CN105310466A (en) * 2015-11-13 2016-02-10 九阳股份有限公司 Method for making rice by adopting cooking utensil

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08150075A (en) * 1994-11-30 1996-06-11 Matsushita Electric Ind Co Ltd Rice cooker
JP2005000490A (en) * 2003-06-13 2005-01-06 Matsushita Electric Ind Co Ltd Rice cooker
JP2005304521A (en) * 2004-04-16 2005-11-04 Matsushita Electric Ind Co Ltd Rice cooker
CN101940433A (en) * 2010-02-22 2011-01-12 谢国华 Electric heating kettle with weighting function and weighting control method thereof
CN102429574A (en) * 2011-10-31 2012-05-02 九阳股份有限公司 Electric pressure cooker capable of automatically controlling pressure and pressure control method thereof
CN105310466A (en) * 2015-11-13 2016-02-10 九阳股份有限公司 Method for making rice by adopting cooking utensil

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Effective date of registration: 20200716

Address after: Floor 2 and 3, No.8, industrial community, South District, west side of Tianhe North Road, Ronggui South District neighborhood committee, Shunde District, Foshan City, Guangdong Province 528000

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Address before: Zhejiang province Yiwu City Chouzhou road 322000 Lane 230, No. 11 unit 1, Room 401

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